A newbie here.
Should Pepper become Rescue in this movie? If this is RDJ's last IM movie, it would be kind of neat to have all of his closest friends in armor.
IF there is a neat and believable way of doing so.
...and if RDJ leaves the IM post behind him, it would probably be wise to recast Pepper at the same time... because it would be awkward to have a different Tony yet the same Pepper.